More details emerged Monday evening in the death of Colorado State Patrol Trooper William Moden, who was hit and killed Friday night on Interstate 70 while investigating an earlier rollover crash in the same area.

The driver of a 1999 Ford F-250 pickup truck that struck Moden is not believed to have been impaired at the time of the crash and is cooperating with investigators, Chief Matthew Packard said at a press conference outside a Commerce City CSP station to which Moden was assigned. The investigation is ongoing.

Moden’s patrol vehicle was parked on the right shoulder of the highway and the driver who hit him was in the left lane, Packard said. The driver of the Ford F-250, an adult male, was not identified.

Packard described Moden, a 12-year-veteran with the CSP, as: “Dedicated and committed to serving the people of Colorado.” Moden was with the Vehicular Crimes Unit of the patrol. He was an on-scene investigator.

“At crash scenes, the VCU members use a special laser-mapping device to gather data for creating scale diagrams,” according to the CSP’s website. “Other equipment is used to measure the friction of the roadway, slopes and to interpret/measure other evidential facts for their reconstructions.”

The woman and her 18-month-old daughter were both ejected, and investigators are crediting the baby’s car seat — she remained in it after being thrown from the vehicle — with saving her life, Arapahoe County Sheriff’s Office spokeswoman Deborah Sherman said.

Witnesses told police the woman, who has not yet been publicly identified, was driving on eastbound Interstate 70 on Friday night at speeds in excess of 100 mph before she crashed at mile marker 324, just east of the Peoria exit, and police said her vehicle rolled over multiple times in a field.

She was ejected from her vehicle as was an 18-month-old toddler in a car seat. No one else was in the vehicle and no other vehicles were involved in the crash, according to police.

Trooper William Moden loved his family and loved being a Colorado State Trooper. Our hearts are heavy and he will be sorely missed. pic.twitter.com/HXhf9frTMu

On Monday, Sherman confirmed that the toddler is the woman’s daughter. She said she could not release the child’s condition.

The Arapahoe County Sheriff’s Office took over the crash investigation involving the woman and her daughter.

Sherman said potential charges against the woman who rolled her vehicle are still pending because of her condition. Detectives are investigating the possibility alcohol played a contributing factor in the crash.

Colorado State Patrol officials have released limited details about the fatal crash, describing the ongoing investigation as preliminary. The driver of the crash remained at the scene Friday night and cooperated with the investigation, said CSP spokesman Trooper Joshua Lewis. CSP has not made any arrests in the crash, he said.

Since Moden’s death, colleagues at the Colorado State Patrol and community members have shown their support for the 37-year-old and his family through various memorials, including leaving cards, flowers and other mementos on his patrol vehicle at 8200 U.S. 85 in Commerce City.

He’s the second state trooper to be struck and killed by a driver on Colorado roads this year and the fifth since 2015.

“People are kind of giving their own salute and honor to (Moden and his family), which we, of course, appreciate greatly,” Lewis said.

Colorado State Patrol Captain Rocco Domenico removes flowers from Trooper William Moden’s patrol car in preparation for the trooper’s funeral outside the Colorado State Patrol Office in Commerce City on Monday, June 17, 2019. Colorado State Patrol Trooper William Moden, 37, was investigating a car crash Friday, June 14, 2019, when he was struck and killed in a second collision.

Gov. Jared Polis ordered that flags across the state be flown at half-staff until Moden’s memorial. A public service for Moden will be held at 11 a.m. Friday at the Denver First Church, 3800 E. Hampden Ave., Englewood.

“He went to work that day because he wanted to make a difference,” Packard said of Moden. “His dedication, 12 years of his life and every ounce of his being…was to make Colorado safer.”

Kieran Nicholson covers breaking news for The Denver Post. He started at the Post in 1986, at the old building on 15th and California streets. Nicholson has covered a variety of beats including suburbs, courts, crime and general assignment.